Study On Clarfication Technology Of Red Wine

1. In this thesis the major factors which can lead to the muddy of red wine and the muddy production mechanism were analysed, and the clarification mechanism of common wine clarificants were analysed too. Gelatin method clarifies the red wine by the absorpting electric charges, which make proteins into deposits. The clarification time of this method is long, which needs several days to several weeks. And after the red wine was bottled, excessive gelatin easily leads the red wine to turbid several days. Pectinase method is to use pectinase to decompose the pectin in the red wine and drop the viscosity of wine, the harmful material lose suspension ability and become sediments, which make the red wine clarified. If pectinase was used too much, protein content in red wine will increase, which may bring disadvantages like proteins muddy in the later storage. Bentonite method can adsorb muddy pellets in the red wine, and then make them from small pellets into big pellets, so the red wine was clarified. But the dosage is much greater (5~20 g/L). Before the clarification, it needs to be mixed up with water and laid up 1 day, the operation is inconvenient and the clarifing time is much longer, most of all, the color of red wine can be decreased.2. According to the experiments, the clarification conditions of common clarificants in red wine were determined, the influences of these clarificants to the qualities and tastes of red wine were also determined. It showed that gelatin-method, pectinase-method and bentonite-method could substantially raise the clarity of red wine. Gelatin-method and pectinase-method had little influence to the physical and chemical compositions of red wine, which would not cause unfavourable influence to the taste quality of red wine. But the clarifying-time of gelatin-method was long, and with a lot of high-molecular pectins. The pectinase-method in the clarification of red wine had little benefit in the stability rising of red wine. Remained proteins brought bad influence to the red wine. In bentonite-method,...